Colon结肠 Ascending colon升结 肠 right colic flexure结肠右曲 Transverse colon横结 他丽v 肠 left colic flexure Descending colon降结 肠 descends almost vertically from left colic flexure to sigmoid colon at left iliac crest Sigmoid colon乙状结肠 extends from descending colon to rectum at level of S3.Colon 结肠 • Ascending colon 升结 肠 – right colic flexure 结肠右曲 • Transverse colon 横结 肠 – left colic flexure • Descending colon 降结 肠descends almost vertically from left colic flexure to sigmoid colon at left iliac crest. • Sigmoid colon乙状结肠 －extends from descending colon to rectum at level of S3